Display panel, preparation method thereof, and display device

Patent metadata

Field	Value
Publication number	US-12016227-B2
Application number	US-202017268091-A
Country	US
Kind code	B2
Filing date	Jun 29, 2020
Priority date	Jul 26, 2019
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

Disclosed in embodiments of the present disclosure are a display panel, a preparation method thereof, and a display device. A display panel having a display area and a non-display area includes: a base substrate; an auxiliary electrode in the non-display area; a passivation layer disposed on a side of the auxiliary electrode facing away from the base substrate, having a first opening in the non-display area, in the first opening, an accommodating space is formed between the passivation layer and the auxiliary electrode, the accommodating space exposes part of the auxiliary electrode; an orthographic projection of the passivation layer on the base substrate covers an orthographic projection of the accommodating space on the base substrate; a cathode layer disposed on a side of the passivation layer facing away from the base substrate, having a connecting portion in the accommodating space, the connecting portion being connected to the auxiliary electrode.

First claim

What is claimed is:

1. A method for preparing a display panel, wherein the display panel is provided with a display area and a non-display area surrounding the display area;
wherein the display panel comprises: a base substrate; an auxiliary electrode disposed on the base substrate and in the non-display area, a passivation layer disposed on a side, facing away from the base substrate, of the auxiliary electrode, and provided with a first opening in the non-display area, wherein in the first opening, an accommodating space is formed between the passivation layer and the auxiliary electrode, the accommodating space exposes at least part of the auxiliary electrode; and an orthographic projection of the passivation layer on the base substrate covers an orthographic projection of the accommodating space on the base substrate; and a cathode layer disposed on a side, facing away from the base substrate, of the passivation layer, and provided with a connecting portion in the accommodating space, the connecting portion being electrically connected to the auxiliary electrode;
wherein the method comprises:
successively forming a pattern of the auxiliary electrode and a pattern of the passivation layer over the base substrate;
applying a voltage to the auxiliary electrode; and
evaporating a cathode material on the passivation layer;
wherein the cathode material carries charges that are electrically opposite to the voltage applied to the auxiliary electrode, and the cathode material, when being evaporated, is attracted to the accommodating space by the auxiliary electrode.

2. The method according to claim 1 , wherein in the first opening, the passivation layer is provided with a first notch, and the accommodating space comprises the first notch.

3. The method according to claim 1 , wherein in the first opening, the auxiliary electrode is provided with a second notch, and the accommodating space comprises the second notch.

4. The method according to claim 3 , wherein the auxiliary electrode comprises a first metal layer and a second metal layer stacked successively, the second metal layer is partially shortened with respect to the first metal layer to form the second notch.

5. The method according to claim 4 , wherein an orthographic projection of the first metal layer on the base substrate covers the orthographic projection of the accommodating space on the base substrate.

6. The display panel according to claim 1 , wherein the display panel further comprises:
a planarization layer disposed between the passivation layer and the cathode layer, and provided with a second opening; an orthographic projection of the second opening on the base substrate covering an orthographic projection of the first opening on the base substrate; and
a pixel defining layer disposed between the planarization layer and the cathode layer, and provided with a third opening; an orthographic projection of the third opening on the base substrate covering the orthographic projection of the first opening on the base substrate;
wherein edges of the first opening, the second opening and the third opening rise stepwise.

7. The method according to claim 6 , wherein the orthographic projection of the second opening on the base substrate covers the orthographic projection of the accommodating space on the base substrate.

8. The method according to claim 6 , wherein the display panel further comprises:
an organic functional layer disposed between the pixel defining layer and the cathode layer;
wherein in the first opening, the organic functional layer is broken at the accommodating space.

9. The method according to claim 1 , wherein the display panel further comprises:
source-drain electrodes in the display area of the base substrate;
wherein the auxiliary electrode is prepared in a same layer as the source-drain electrodes.

10. The method according to claim 1 , wherein the auxiliary electrode is an annular electrode surrounding the display area, and the first opening is an annular opening surrounding the display area.

Assignees

• Hefei Xinsheng Optoelectronics Technology Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Liu Hao
• Xie Xuewu
• Sun Shi
• Ai Yu
• Liu Bowen
• Kong Yubao
• Zhang Ameng

Classifications

• H10K59/80522 Primary

  combined with auxiliary electrodes · CPC title

• H10K59/1315 Primary

  comprising structures specially adapted for lowering the resistance · CPC title

• H10K59/124 Primary

  Insulating layers formed between TFT elements and OLED elements · CPC title

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title